Polyether carbonates by DMC catalysis

摘要

This invention relates to a process for preparation of polyether alkoxylated carbonates. These products may also be referred to as polyether polycarbonates. This process simultaneously transcarbonates and alkoxylates a mixture of one or more carbonate compounds, and one more hydroxyl group containing compounds, with at least one alkylene oxide in the presence of a mixture of catalysts. The catalyst mixture contains at least one DMC catalyst and at least one non-alkaline transesterification catalyst. This invention also relates to novel polyether polycarbonates, a process for preparing polyurethane foams from these novel polyether polycarbonates and to foams comprising these novel polyether polycarbonates.

主权项

1. A process for preparing a polyether carbonate product, which comprises simultaneously:
(A) transcarbonatingand
(B) alkoxylating
(1) a mixture comprising
(a) a compound which is selected from the group consisting of dialkyl carbonates, diaryl carbonate, alkylaryl carbonates, polycarbonates and mixtures thereof, wherein said compound has a number average molecular weight of from 90 to 6000;and(b) one or more hydroxyl group containing compounds selected from the group consisting of (i) alcohols which contain from 1 to 25 carbon atoms, (ii) polyols having a functionality of 2 to 6 and a number average molecular weight of less than 3000 and (iii) mixtures thereof;with(2) at least one alkylene oxide;in the presence of(3) a mixture of catalysts comprising
(a) at least one DMC catalyst,and(b) at least one non-alkaline transesterification catalyst.